Hi welcome to H.C,M.Forum. fissure is a cut in a part of the anus due to hard stools. in your case the fissure have become chronic.the cause of your hard stools also should be screened . the use of laxatives for long time also causes constipation
. i advise you to consult a surgeon for diagnosis.
you may have to undergo minor surgery, it need not be scared of.
besides i advise you to eat more of fibrous food. eat more of green leafy vegetables, fruits, juices, & cereals for quick recovery. wishing for an early recovery.